<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>菜头3.2</title>
  <style>
    .bigblock {
      width: 502px;
      height: 288px;
      padding: 43px 57px 61px 27px
    }
    .littleone {
      float: left;
      width:300px;
      height:288px ;
      background-color: #999999
    }
    .littletwo {
      float: right;
      width: 190px;
      height:138px;
      background-color: #0099FF
    }
    .littlethree {
      float: right;
      width: 190px;
      height:138px;
      background-color: #99FF00;
      margin-top: 12px
    }
  </style>
</head>
<body>
  <div class="bigblock">
    <div class="littleone"></div>
    <div class="littletwo"></div>
    <div class="littlethree"></div>
  </div>
</body>
</html>